Design Patter by PHP[6]: Prototype

Date: 2006-11-26 (Sun)
Category: Design Pattern

第六回目は Prototype です。コードは毎回 Subversion のレポジトリ

http://svn.nydd.org/dpxphp/Prototype/

にあります。

今回から UML 図を書いてみることにしました。っていうか、全部本に書いてある通りですけれども。

今回の気づき

PHP の clone は、Java のようなメソッドではなく、new などと同じ、言語構造。しかし個別 class にて __clone() という特殊なメソッドを用意すれば、override 可能。
オブジェクトのクローンが作成される際、PHP 5 は、そのオブジェクトのプロパティを全てシャローコピーします。他の変数へのリファレンスを保持する全てのプロパティは、リファレンスのままとなります。 __clone() メソッドが定義された場合、新規の作成されたオブジェクトの __clone() メソッドがコールされるため、この中で、プロパティに必要な変更を行うことができます。
上記引用ページに出てくる self というキーワード。どっかで読んだけどなんだっけ？ static キーワードにあるように、static な変数にアクセスする this ということですな。予約語の一覧というページのユーザコメントに、
The list also seems to be missing both "parent" and "self" as well.
とある（しょーもな…）。
interface に abstract 宣言は必要ない、というより設定するとエラーが出る。

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